net: sched: taprio: Refactor taprio_get_start_time()

	return 0;

}

static ktime_t taprio_get_start_time(struct Qdisc *sch)

static int taprio_get_start_time(struct Qdisc *sch, ktime_t *start)

{

	struct taprio_sched *q = qdisc_priv(sch);

	struct sched_entry *entry;

	s64 n;

	base = ns_to_ktime(q->base_time);

	cycle = 0;

	now = q->get_time();

	if (ktime_after(base, now)) {

		*start = base;

		return 0;

	}

	/* Calculate the cycle_time, by summing all the intervals.

	 */

	cycle = 0;

	list_for_each_entry(entry, &q->entries, list)

		cycle = ktime_add_ns(cycle, entry->interval);

	if (!cycle)

		return base;

	now = q->get_time();

	if (ktime_after(base, now))

		return base;

	/* The qdisc is expected to have at least one sched_entry.  Moreover,

	 * any entry must have 'interval' > 0. Thus if the cycle time is zero,

	 * something went really wrong. In that case, we should warn about this

	 * inconsistent state and return error.

	 */

	if (WARN_ON(!cycle))

		return -EFAULT;

	/* Schedule the start time for the beginning of the next

	 * cycle.

	 */

	n = div64_s64(ktime_sub_ns(now, base), cycle);

	return ktime_add_ns(base, (n + 1) * cycle);

	*start = ktime_add_ns(base, (n + 1) * cycle);

	return 0;

}

static void taprio_start_sched(struct Qdisc *sch, ktime_t start)

	}

	taprio_set_picos_per_byte(dev, q);

	start = taprio_get_start_time(sch);

	if (!start)

		return 0;

	err = taprio_get_start_time(sch, &start);

	if (err < 0) {

		NL_SET_ERR_MSG(extack, "Internal error: failed get start time");

		return err;

	}

	taprio_start_sched(sch, start);